Heating stove or furnace



(No Model.)

'M. 0. HULL. HEATING STOVE 0R FURNACE.

lad i fire-door was shut.

UNITED STATES PATENT OFFICE.

MAURIGE o. HULL, OF wEsr ORANGE, NEW JEnsEY.

HEATING s ovE'oR FURNACE.

To all whom it may concern:

Be it known that I, MAURICE O. HULL, of West Orange, in the county ofEssex and State of New Jersey, have invented anImprovement in HeatingStoves or Furnaces, of which the following is a specification.

In stoves or furnaces for heatingbuildings the gases often escape inconsequence of opening the door either for slackening the fire or forsupplying fuel. This escape often arises from an accumulation of gasesin the upper part of the fire-chamber, there being no opening that issufficient for removing these gases as they arise from the coal, thedischarge-flue for such gases usually being nearly at the level of thefiredoor, or else of such a character that they become obstructed by thefuel or by ashes. In cases where there are partitions in thefire-chamber or around the same the gases accumulate on both sides ofthese partitions, and are not drawn oil in a manner that prevents themescaping when the door is open.

My present invention is for discharging the gases from the fire-chamberby means of pipes inside the combustion-chamber,which form descendin gfines partially within the combustion-chamber, so that the products ofcombustion ascend to the top of the dome and then descend through suchescape-fines in such a manner that the hottest of the gases from thefire-chamber will pass to the escape flue. Hence the draft in thechimney will not be suddenly cooled by the opening of the feeding-door,and the strength of draft will be maintained for carrying away theescape gases when the door is opened the same as it the By thisimprovement the heating capacity of the furnace or stove will beaugmented.

In the drawings, Figure 1 is a perspective view representing the furnaceas partially broken open. Fig. 2 is a vertical section. Fig. 3 is aplan, partially in section; and Fig.4 is a section through thedust-flue.

The grate-bars L above the ash-pit M are of ordinary construction, andthe fire-chamber above the grate-bars is made of a casing, F, with a topor dome, F; and at the bottom the casing F is united to the fire-pot andlined with fire-brick. This casin g F is preferably of wrought-iron orsteel plates riveted together.

I. SPECIFICATION forming part of Letters Patent No. 263,705, datedSeptember 5, 1882.

l Application filed July 7; 1882.

(No model.)

The fire-door N and ash-door O are of ordinary character; and the wholefurnace may be placed in an air-chamber o'f brick,with hotair pipesleading therefrom; or the casin g 8 may be metal of any desiredcharacter; or the improvement may be used in a stove that is not in ahot-chamber.

From the fire-chamber there is a direct flue, E, to a chimney. When thedamper at 1? is closed the products of combustion from the fire-chamberpass by the fines A and B to the semi-cylindrical base-flue G, andthence by the pipe D to the chimney-flue E. In this hollow base 0 thereshould be hanging partitions to prevent the heated air passing away toorapidly to the flue D. The lines A areprcferably made with slightlycontracted upper ends, that are inside the chamber and near the, top ordome thereof, so that the hot air in the tirechamber will not beconveyed away too suddenly or in too great volume, the open end of eachpipe being uppermost. Each flue-pipe A curves or inclines outwardly asit descends, and it passes through the casingF, where it is providedwith a flange, I), through which are rivets to secure it to the casingF. This flue A and flange b are preferably cast in one piece, and theflue A, being of a tapering form, can be passed from the outside of thecasingin through the opening therein and turned upwardly to place. Thesheet-metal pipe B is a continuation downwardly of the lower part of theflue A. The bottom part of the flue A is at a sufficient inclination toprevent ashes or dust lodging or interfering with the draft. By

. this construction I am enabled to take off the gases and products ofcombustion from the top part of the fire-chamber with the necessaryrapidity to prevent them escaping when the fire-door is opened, and theupper ends of come obstructed bythe dust. In consequence of placing thedust-flue at an upward inclination, with a vertical damper slidinghorizontally, the flue becomes self-cleaning, and the damper, whenmoved, frees itself from dust that may lodge upon it, and the dust thatsettles in the flue is returned into the ash-pit.

I claim as my invention- 1. The combination, with the fire-chamber andthe casing F above the grate-bars, of the fines E D G B, and the flue A,having a flange, b, by which it is attached to the casing F, the endbeing tapering, and having the opening at the upward end, substantiallyas set forth.

2. The combination, with the casin g F, forming a fire-chamber, of oneor more fiues, A,

1 having their open upper ends within the firechamber, or passingdownwardly, first inside and then outside the combustion-chamber,substantially as set forth. e

3. The combination, with the casing F, forming a combustion-chamberabove the fire, of one or more descending flues, A, having contractedupper ends, within the fire-chamber and near the top thereof, and aninclined bot- 25 tom to each flue, so as to be self-cleaning,substantiall y as set forth. Signed by me this 1st day of July, A. D.1882.

M. O. HULL.

Witnesses Gno. T. PINQKNEY, WILLIAM G. MOTT.

